10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Hi all!
Thanks for taking the time to view this!
I want to grep out all lines of a file that starts with pattern 1 but also does not match with the second pattern.
Example:
Drink a soda
Eat a banana
Eat multiple bananas
Drink an apple juice
Eat an apple
Eat multiple apples
I... (8 Replies)
Discussion started by: demmel
8 Replies
2. Shell Programming and Scripting
Hello
I have a large file1 which has many events like "2014010420" and following lines under each event that start with text . It has this form:
2014010420 num --- --- num ....
NTE num num --- num...
EFA num num --- num ...
LASW num num --- num... (9 Replies)
Discussion started by: phaethon
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3. Shell Programming and Scripting
Here is the task that I was presented with:
I am dealing with about a 10,000 line input deck file for an analysis. About 10 separate blocks of around 25 lines of code each need to be updated in the input deck.
The input deck (deckToChange in the code below) comes with 2 separate files. File 1... (5 Replies)
Discussion started by: tiktak292
5 Replies
4. Shell Programming and Scripting
Dear All,
I would like to compare two files and return the number of matches found.
Example
File A
Lx2
L1_Mus1
L1Md_T
Lx5
L1M2
L1_Mus3
Lx3_Mus
Lx9
Lx2A
L1Md_A
L1Md_F2
File B
L1_Mus3
L1_Mus3 (3 Replies)
Discussion started by: paolo.kunder
3 Replies
5. Shell Programming and Scripting
I have a file that looks like this:
John Smith
http://www.profile1.com
http://www.profile2.com
http://www.profile3.com
Marc Olsen
http://www.profile4.com
http://www.profile5.com
http://www.profile6.com
http://www.profile7.com
Lynne Doe
http://www.profile8.com
http://www.profile9.com... (3 Replies)
Discussion started by: locoroco
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6. Solaris
Hi guys,
I usualy am able to google awk stuff but I can't find it so far and there are so many awking gurus here that I will give it a shot.
I want to print $1;$3;"$5 up to the $NF". In other words, I can have 1000 colums, but need to have $5 up to the end.
I started with the idea of... (2 Replies)
Discussion started by: plmachiavel
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7. Emergency UNIX and Linux Support
Hi ,
I have a huge file like this
=245 this is testing
=035 abc123
=245 this is testing1
=035 abc124
=245 this is testing2
=035 abc125
=035 abc126
=245 this is testing3
here i have to pull out those lines having two =035 instead of alternative 035 and 245 i.e extract... (18 Replies)
Discussion started by: umapearl
18 Replies
8. Shell Programming and Scripting
Looking for awk statement that will match all lines starting with "# "
if ( $1 == \^"#" )
Input file:
# of the server. If you would like to set these, please take out the
# pound (#) sign in front of one or all severities and set it equal to
# severity desired. For example, FATAL=3
#... (2 Replies)
Discussion started by: Arsenalman
2 Replies
9. Shell Programming and Scripting
Hi ,
I have file, which has the below content:
line 100
a
b
c
d
line300
a
s
d
f
s
line200
a
s
d
a (3 Replies)
Discussion started by: little_wonder
3 Replies
10. Shell Programming and Scripting
I need to have an if statement in a script to run if there are certain processes running. Easiest way I can see to do this is to run a ps and grep the results based on what I am looking for:
$ ps -ef | grep wtrs
---
webtrend 5046 1 0 May 12 ? 0:28 /webtrends/versions/6.1/wtrs_ui... (6 Replies)
Discussion started by: LordJezo
6 Replies
awk(1) General Commands Manual awk(1)
Name
awk - pattern scanning and processing language
Syntax
awk [-Fc] [-f prog] [-] [file...]
Description
The command scans each input file for lines that match any of a set of patterns specified in prog. With each pattern in prog there can be
an associated action that will be performed when a line of a file matches the pattern. The set of patterns may appear literally as prog,
or in a file specified as -f prog.
Files are read in order; if there are no files, the standard input is read. The file name `-' means the standard input. Each line is
matched against the pattern portion of every pattern-action statement; the associated action is performed for each matched pattern.
An input line is made up of fields separated by white space. (This default can be changed by using FS, as described below.) The fields
are denoted $1, $2, ... ; $0 refers to the entire line.
A pattern-action statement has the form
pattern { action }
A missing { action } means print the line; a missing pattern always matches.
An action is a sequence of statements. A statement can be one of the following:
if ( conditional ) statement [ else statement ]
while ( conditional ) statement
for ( expression ; conditional ; expression ) statement
break
continue
{ [ statement ] ... }
variable = expression
print [ expression-list ] [ >expression ]
printf format [ , expression-list ] [ >expression ]
next # skip remaining patterns on this input line
exit # skip the rest of the input
Statements are terminated by semicolons, new lines or right braces. An empty expression-list stands for the whole line. Expressions take
on string or numeric values as appropriate, and are built using the operators +, -, *, /, %, and concatenation (indicated by a blank).
The C operators ++, --, +=, -=, *=, /=, and %= are also available in expressions. Variables may be scalars, array elements (denoted x[i])
or fields. Variables are initialized to the null string. Array subscripts may be any string, not necessarily numeric; this allows for a
form of associative memory. String constants are quoted "...".
The print statement prints its arguments on the standard output (or on a file if >file is present), separated by the current output field
separator, and terminated by the output record separator. The statement formats its expression list according to the format. For further
information, see
The built-in function length returns the length of its argument taken as a string, or of the whole line if no argument. There are also
built-in functions exp, log, sqrt, and int. The last truncates its argument to an integer. substr(s, m, n) returns the n-character sub-
string of s that begins at position m. The function sprintf(fmt, expr, expr, ...) formats the expressions according to the format given
by fmt and returns the resulting string.
Patterns are arbitrary Boolean combinations (!, ||, &&, and parentheses) of regular expressions and relational expressions. Regular
expressions must be surrounded by slashes and are as in egrep. Isolated regular expressions in a pattern apply to the entire line. Regu-
lar expressions may also occur in relational expressions.
A pattern may consist of two patterns separated by a comma; in this case, the action is performed for all lines between an occurrence of
the first pattern and the next occurrence of the second.
A relational expression is one of the following:
expression matchop regular-expression
expression relop expression
where a relop is any of the six relational operators in C, and a matchop is either ~ (for contains) or !~ (for does not contain). A condi-
tional is an arithmetic expression, a relational expression, or a Boolean combination of these.
The special patterns BEGIN and END may be used to capture control before the first input line is read and after the last. BEGIN must be
the first pattern, END the last.
A single character c may be used to separate the fields by starting the program with
BEGIN { FS = "c" }
or by using the -Fc option.
Other variable names with special meanings include NF, the number of fields in the current record; NR, the ordinal number of the current
record; FILENAME, the name of the current input file; OFS, the output field separator (default blank); ORS, the output record separator
(default new line); and OFMT, the output format for numbers (default "%.6g").
Options
- Used for standard input file.
-Fc Sets interfield separator to named character.
-fprog Uses prog file for patterns and actions.
Examples
Print lines longer than 72 characters:
length > 72
Print first two fields in opposite order:
{ print $2, $1 }
Add up first column, print sum and average:
{ s += $1 }
END { print "sum is", s, " average is", s/NR }
Print fields in reverse order:
{ for (i = NF; i > 0; --i) print $i }
Print all lines between start/stop pairs:
/start/, /stop/
Print all lines whose first field is different from previous one:
$1 != prev { print; prev = $1 }
Restrictions
There are no explicit conversions between numbers and strings. To force an expression to be treated as a number add 0 to it; to force it
to be treated as a string concatenate "" to it.
See Also
lex(1), sed(1)
"Awk - A Pattern Scanning and Processing Language" ULTRIX Supplementary Documents Vol. II: Programmer
awk(1)